Karthik Nayak [off-list ref] writes:

quoted

I have personal preferences, and usually I'd like to hear from
others first before mentioning my preference, but for something this
small and does not affect readability very much, perhaps I can just
pick and dictate?  I dunno ;-).

I wouldn't mind if you picked one over the other, like I mentioned, I
care more that we make it consistent and that the formatter can notify
or fix it for us.

Then let's declare that these shall be written like so:

    unsigned my_field:1;
    unsigned other_field:1;
    unsigned field_with_longer_name:1;

without a space around the colon.  It would allow us not to modify
the clang-format file, and more importantly, discourage people from
doing ugly alignment with spaces, i.e.

    unsigned my_field               : 1;
    unsigned            other_field : 1;
    unsigned field_with_longer_name : 1;